Steam-boiler.



PATENTED JAN. 9, 1906.

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G MARSHALL STEAM BOILER. APPLICATION FILED mm: 12, 1905.

No. 809,517. PATENTED JAN. 9 1906.

G. MARSHALL.

STEAM BOILER.

APPLICATION FILED JUNE 12, 1905.

2 SHEETS-SHBET 2.

Gleaiye Jlarakall UNITED STATES PATENT OFFICE.

GEORGE MARSHALL, OF FREMONT, NEBRASKA.

STEAM-BOILER.

Specification of Letters Patent.

Patented Jan. 9, 19(J6.

Application filed June 12, 1905. Serial No. 264,827-

their ends to the boiler-heads and the principal object of my invention is to provide a strong and durable connection between the tubes and the boiler-heads and to prevent leakage.

In carrying out my invention the ends of the fire-tubes are connected to. the boilerheads in the usual way, and to the rear head next the fire-box I attach a protecting-plate, which is formed with holes registering with the tubes and which is calked t0 the boilerhead around its entire exterior edges and also around the holes which register with the firetubes, so as to secure each tube to the head by an annular calk formed in the protectingplate. As an additional protection I cover the plate with a protecting-wall constructed of sectional tiles so formed as to be easily put together and taken apart and which may be readily secured to the protecting-plate or detached therefrom.

In the accompanying drawings, Figure 1 shows a vertical section of a portion of a steam-boiler with my improvements applied. Fig. 2 shows an end elevation thereof. Fig. 3 shows an end elevation with the sectional tile protecting-wall removed. Fig. 4 is a detail view illustrating the relation of the protecting-plate, the boiler-head, and the metallic frame of the protecting-wall. Fi 5 shows an end elevation of the boiler witi my improvements applied and with parts of the protecting-wall detached' Fig. 6 shows a vertical section on the line 6 6 of Fig. 5. Figs. 7 to 11, inclusive, illustrate in perspective the forms of the several parts of the protecting-wall. Fig. 12 is a detail view, on an enlarged scale and in section, illustrating the manner in which the protecting-plate is calked upon the ends of the fire-tubes. Fi s.

13, 14, and 15 are perspective views of t e several parts 6f the metallic frame of the protecting-wall.

The boiler A, fire-tubes B, and boiler-head G are of usual construction. The fire-tubes have their ends projecting through the head C and spun over, as indicated at in in Fig. 12. This is a usual way of connecting fire-tubes to a boiler-head, but one which permits leaka e, owing to the expansion and contraction of the metal next to the fire-box. In order to provide a strong and durable connection and to prevent leakage, I employ a protecting-plate D, which is made of comparatively thick metal and is secured by boltsd and nuts (1 to the head C. This plate is calked around its edges at y to the boiler-head C, and any leakage that may occur will ordinarily be confined between the plate and the boilerhead. The plate D is formed with openings E registering with the tubes B. Preferably the walls of these openings are beveled at e, so as to permit of their being calked at e to thereby clamp the spun ends of the tubes and to make a tight joint, preventing or impeding any leakage. It will thus be seen that the plate is firmly united to the boilerhead, it is calked around its edges, and each tube has its end connected with the plate by an annular calking. This protecting-plate is very efficient without further protecting means; but I prefer to employ also a protecting-wallF, composed of fire-brick or tile. This protecting-wall is made in sections, so that it may be easily set up or taken apart, and it is held in place in front of the protecting-plate by means of metallic frame-pieces G H I. (Illustrated in Figs. 13, 14, and 15.)

The frame-piece G consists of a cross-piece g, which stands out from the boiler-head C, and feet or standards g, which are attached to the boiler-head in the manner illustrated in Fig. 3, just above the plate D. The framepiece H comprises a cross-piece h, extending from opposite sides of a central piece h ,which latter is arranged horizontally and is provided at its inner end with a vertical flange 7%, which is attached to the plate D about midway between its upper and lower ends. The flange h is notched or formed with recesses at h3 to accommodate the nuts (1 and to uncover the openings in the tubes B. The frame-piece I (shown in Fig. 15) comprises a base i, which is attached to the plate D near its lower end, a body portioni which projects horizontally from the plate, and a flange 47, which is turned downward. The frame-piece G is secured to the head 0 at c. The framepiece H is secured to the plate at c, and the frame-piece I is attached to the plate at 0 The protecting-wall comprises four principal parts or sections J J K K and six smaller parts L L M M N N. The parts J J K K are formed with holes j 7c, registering with the holes in the plate D. The parts J J are formed to approximately cover the upper half of the plate D, while the parts K K are formed to approximately cover the lower part of the plate D. The form of the outside of the sections J J K K. is clearly indicated in Fig. 5, while the interior construction is shown in Figs. 8 and 10. The sections J J are formed in their upper walls with slots P, extending from the top inwardly. These slots receive the frame-piece G, and these sections J are recessed to receive the plate D that is, they are formed with flanges p, which overlap the edges of the plate. They are also formed with recesses p to receive the sections L, which are illustrated particularly in Fig. 7. The sections K K are formed with flanges 7c, which overlap the edges of the plate D, with recesses it, which engage the flange i and with slots 7c, which engage the cross-piece H. All the sections J J K K are recessed at g to accommodate the heads d of the bolts d. These main sections are first connected with the frame-pieces G H I in the manner specified, and then these framepieces are attached to the plate D by the devices c c 0 Then the parts L M N are put in place. The parts L are inserted in the recesses p by being shoved back into them, the inner ends of the parts L being recessed at Z to accommodate the securing devices a. The parts M are then moved horizontally or laterally inward in the manner indicated by the arrows in Fig. 5. These sections M M have flanges m overlapping the plate D, and

they are formed with suitably-shaped recesses m to provide'a sliding connection with the frame-piece H. The form of the recesses m is illustrated in Fig. 9. The sections N N are assembled by being moved laterally in the direction indicated by the arrows in Fig. 5. Theyhave flanges a, covering the edges of the plate D, and they are formed with grooves n to connect with the frame-piece I. It will be seen, therefore, that the protecting-wall has four main parts which are connected with three frame-pieces that are attached to the plate I) and the boilerhead, the sections bemg provided with recesses or openings to permit of the securing devices being applied and tightened. In Fig. 5 it will be observed that all of the securing devices are exposed. These are, however, covered by the sections L M N which are inserted in the manner specified and which when inserted are held firmly in place, the parts L L resting on the sections J J, the sections M M resting on the sections K K and also being interlocked with the frame-piece H, while the sections N N are interlocked with the frame-piece I. In this way a protecting-wall of tileor fire-brick is presented to the direct action of the flame or products of combustion and the connection between the tubes and the boiler-head and the protecting-plate is preserved. There are other ways of forming a protecting-wall for the plate D; but that shown is preferred. The details of construction may of course be somewhat varied.

I claim as my invention 1. A steam-boiler having its fire-tubes projecting beyond the tube-sheet and beaded as described, and a metallic protectingplate resting in close contact with the tube-sheet, and having holes registering with the tubes, the walls of the holes being formed to closely surround the beaded ends of the tubes, being flared or inclined outwardly and inclined or curved inwardly by being calked around the beaded ends of the tubes to tightly fit them.

2. The combination of a tube-sheet, firetubes projectingtherethrough and beaded as described, a protecting-plate secured to the tube-sheet, being in close contact therewith and having holes registering with the tubes, the walls of the said holes being formed to fit the beaded ends of the tubes and being calked thereto to make a tight joint, and a protecting-wall made in separable flanged sections, applied to the plate and completely covering its front face and its four edges.

3. The combination of the boiler-head, the fire-tubes, the protecting-plate secured to the boiler-head, the metal frame-pieces attached to the plate and the sectional protecting-wall connected with the frame-pieces.

4. The combination of the fire-tubes, the boiler head, the protecting plate attached thereto, the frame-pieces attached to the plate and the protecting-wall having interlocking connections with the frame-pieces and. recesses to expose the fastening devices of the frame-pieces, and the wall-sections for filling said recesses.

In testimony whereof I have hereunto subscribed my name.

GEORGE MARSHALL.

Witnesses:

W. J. COURTRIGHT, VANARDA KURTZ. 

